Why does 1-1/2 inch fit many prep tables?

Many prep tables use tubular legs where the inside diameter is close to 1-1/2 inch. Some legs may have about 1-5/8 inch outer diameter, so verify the inside diameter before ordering.

Expanding Adapter Casters (Rubber Expansion Stem)

Q: What is an expanding adapter caster used for?

An expanding adapter caster mounts into a hollow tubular leg by expanding a rubber sleeve against the inside wall, creating a tight fit without inserts, weld plates, or through-bolts.

Q: How do I pick the correct adapter size?

Measure the inside diameter (ID) of the leg or tube and choose the matching 'Fits X" ID Tube' option. Do not select based on outer diameter.

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Expanding Adapter Casters (Rubber Expansion Stem)

TUBE / LEG ID FIT • FAST RETROFIT • RATTLE-RESISTANT

Expanding adapter casters lock into hollow legs / tubing by tightening an internal mechanism that expands a rubber sleeve against the inside wall. This creates a secure fit without threaded inserts, weld plates, or through-bolting—ideal for retrofit and OEM builds on tubular frames.

Prep tables Work tables Racks Lab / medical stands

Select by Tubing Inside Diameter (ID)

Choose the size that matches your tube/leg inside diameter (ID). ID is what matters—OD can be misleading.

Fits 3/4" ID Tube Compact legs and light equipment frames Fits 7/8" ID Tube Common small tubing ID Fits 1" ID Tube General-purpose tubular legs and frames Fits 1-1/8" ID Tube Mid-size equipment legs Fits 1-3/16" ID Tube Less-common ID — measure to confirm Fits 1-1/4" ID Tube Popular for tables, carts, and racks Fits 1-3/8" ID Tube Heavier leg tubing — verify wall thickness Fits 1-1/2" ID Tube (Most Popular) Common for kitchen prep tables, stainless prep tables, medical and lab tables Fits 1-5/8" ID Tube Larger tubing — often used on heavier tables and fixtures Fits 1-7/8" ID Tube Large-ID legs — measure carefully

Critical fit note (prep tables): A “1.5 inch” adapter refers to inside diameter (ID). Some prep tables have ~1-5/8" outer diameter legs, but you must measure the leg ID to confirm it is actually 1-1/2" before ordering.

Typical Configuration Envelope

Expanding adapter casters with rubber expansion stems for tubular legs. Select by tube inside diameter (ID) from 3/4 inch through 1-7/8 inch. Common wheel sizes 3 to 5 inches.

Mount Type: Rubber expansion stem (tightens to expand sleeve)
Wheel Diameters: Typically 3"–5"
Capacity: ~300–350 lb per caster (model dependent; verify per SKU)
Fit Requirement: Match adapter size to tube/leg inside diameter (ID)
Typical Equipment: prep tables · work tables · racks · fixtures · carts

Selection Guidance

Measure ID correctly (the fastest way to avoid wrong orders)

Measure ID, not OD: the adapter indexes off the inside diameter of the tube/leg.
Check both legs: dents, weld seams, or debris can change the effective ID.
Wall thickness matters: thin-wall tubing may need careful tightening to avoid distortion.

Why round rubber adapters work in square tubing

Round expansion sleeves apply force more evenly and tolerate minor ID variation. In square legs, the rubber expands to fill gaps and corners for a stable, rattle-resistant fit.

Load and wheel size selection

Load math: total load ÷ number of casters, then add margin for shock/impact.
Debris/thresholds: larger wheels roll easier over grout lines and transitions.
Push force: if the table is hard to move, consider larger wheel diameter (when available).

Get sizing help

FAQ

What is an expanding adapter caster used for?

It mounts into a hollow tubular leg by expanding a rubber sleeve against the inside wall, creating a tight fit without welded plates, inserts, or through-bolts.

How do I pick the correct adapter size?

Measure the inside diameter (ID) of the leg/tube and choose the matching “Fits X" ID Tube” option. Do not select based on outer diameter.

Why does 1-1/2" fit many prep tables?

Many prep tables use tubular legs where the inside diameter is close to 1-1/2". Some legs may have ~1-5/8" outer diameter, so verify the inside diameter before ordering.

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Caster Engineering Tools

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